Manufacture of anilin dyestuffs.



UNITED STATES PATENT OFFICE.

DESIRE DE NAGY, OF LONDON, ENGLAND, ASSIGN OR OF FIFTEEN ONE-HUNDREDTI-IS TO ALFRED ERNEST KING AND FIFTEEN ONE-HUNDREDTHS T0 GEORGE HENRY ODELL,

BOTH OF LONDON, ENGLAND.

MANUFACTURE OF ANILIN DYESTUFFS.

No Drawing.

To all whom it may concern:

Be it known that I, Dnsmfi DE NAGY, a subject of the King of Hungary, residing at 10 West Kensington Mansions, London, England, have invented a certain new and useful Manufacture of Anilin Dyestuffs, of which the following is a specification.

This invention relates to the production, either in substance or on the fiber, of valuable dyestuffs, dyeing black, blue and red and their combinations or kindred shades by the oxidation of aromatic amins by using an oxidizing agent not hitherto employed for this purpose.

According to this invention the oxida tion is carried out by the use of molybdates, instead of the salts of copper, iron, arsenic and vanadium.

i The dyestuffs obtained by the use of molybdates possess great fastness to light. As an example: A red dye may be obtained by taking the following Hydrochloric acid (18 B.) 5 Anilin oil 5 Para-nitranilin 1 Nitrobenzol 2 Ammonium molybdate 3/100 These constituents are boiled together and kept at a temperature raised to 200 to 230 C. until the mass is a paste. This paste is then dissolved in hot water and when cool is precipitated with caustic soda.

In use, 5 grams of the red dye may be dissolved in 1 liter of hot water at a temperature of 70 to 80 0., and the solution is made slightly acid with acetic acid. The stuff to be dyed is immersed in the bath, the temperature being maintained for about half-an-hour to one hour, and is then rinsed in cold water and allowed to dry.

Apart from the use of molybdates the dye baths are otherwise made up in the usual manner for black, blue and red colors and their combinations or kindred shades.

The following example will illustrate the process in the case of producing black or black-blue color direct on the fiber Copies of this patent may be obtained for five cents each, by addressing the Patented Dec. 18, 1917.

Application filed June 28, 1917. Serial No. 177,560.

A bath is made up of Chloranilin, 0 or p 5 Hydrochloric acid (18 B.) 25 Ammonium molybdate 2/100 Diphenylamin 1 2 Potassium bichromate 5 Potassium chlorate 1 8/10 dissolved in one liter of boiling water. In this bath which is preferably at a temperature of 70 C. silk, wool, or cotton is immersed for an hour without using any mordant. This give the best result but the operation may be also conducted cold throughout, or the temperature may even be raised to boiling point. The only subsequent treatment of the fibers is to immerse them in dilute caustic soda lye, which gives the best deep black and black-blue shades. The fibers exhibit a much more intense shade which possesses decidedly increased fastness to the action of light.

I claim 1. An anilin dyestufl mixture comprising aromatic amins and a molybdate.

2. An anilin dyestufi mixture comprising aromatic amine and ammonium molybdate.

3. The production of an anilin dyestutt' which comprises boiling and heating together constituents comprising aromatic amins and a molybdate, until the mass becomes a paste, diSSOlViIlg the mass in hotwater, and precipitating the product with caustic soda, substantially as set forth.

4. The production of dyestuffs on the fiber comprising immersing the material in a bath containing aromatic amins and a molybdate for the oxidation thereof.

5. The production of dysetuifs on the fiber comprising immersing the material in a bath containing aromatic amins and ammonium molybdate for the oxidation of such amins.

6. The production of black colors direct on the fiber consisting firstly in immersing the material in a bath containing chloranilin, diphenylamin and ammonium molybdate, and secondly in immersing the said materials in a bath of dilute caustic soda lye.

Commissioner of Patents,

Washington, D. G. 

